UE X2 / UE S1 signaling references enable the target eNB to address the source eNB and the EPC. The E-RAB context includes necessary RNL and TNL addressing information, and QoS profiles of the E-RABs.

Admission Control may be performed by the target eNB dependent on the received E-RAB QoS information to increase the likelihood of a successful HO, if the resources can be granted by the target eNB. The target eNB configures the required resources according to the received E-RAB QoS information and reserves a C-RNTI and optionally an RACH preamble.

The target eNB prepares HO with L1/L2 and sends the HANDOVER REQUEST ACKNOWLEDGE to the source eNB.

The HANDOVER REQUEST ACKNOWLEDGE message includes a transparent container to be sent to the UE as an RRC message to perform the handover.

The container: includes a new C-RNTI, target eNB security algorithm identifiers for the selected security algorithms,
may include a dedicated RACH preamble, and possibly some other parameters i.e. access parameters, SIBs, etc.

Types of Handover in LTE network

Intra-LTE Handover: In this case source and target cells are part of the same LTE network. means handover in same LTE cell.Inter-LTE Handover: Handover happens towards other LTE nodes. means other Enb. (Inter-MME and Inter-SGW)Inter-RAT: Handover between different radio technologies. For example handover from LTE to WCDMA. As similar to inter Vendor Handover.